#1B428B#1B428B

#1B428B is a dark, vivid blue. Relative luminance 0.060; OKLCH L 39.6% C 0.130 H 261.5°. Best body text is #FFFFFF at 9.55:1 contrast (WCAG AA passes).

Color values

HEX	#1B428B
RGB	rgb(27, 66, 139)
HSL	hsl(219, 67%, 33%)
HSV	hsv(219, 81%, 55%)
CMYK	cmyk(80.6%, 52.5%, 0%, 45.5%)
CIE-LAB	lab(29.39, 14.50, -44.54)
CIE-LCH	lch(29.39, 46.84, 288.04°)
OKLab	oklab(39.62% -0.0192 -0.1282)
OKLCH	oklch(39.62% 0.13 261.5)
XYZ	xyz(7.0587, 5.9927, 25.2058)
Luminance	0.0599 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B428B #8B641B

analogous

#1B7A8B #1B428B #2C1B8B

triadic

#1B428B #8B1B42 #428B1B

tetradic

#1B428B #8B1B7A #8B641B #1B8B2C

square

#1B428B #8B1B7A #8B641B #1B8B2C

split-complementary

#1B428B #8B2C1B #7A8B1B

monochromatic

#071125 #112A58 #1B428B #255ABE #457ADB

Accessibility & contrast

On white

9.55

#1B428B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.20

#1B428B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B428B

9.55:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B428B	#FFFFFF	#000000	##FFFFFF
##1B428B	1.00	9.55	2.20	9.55
#FFFFFF	9.55	1.00	21.00	1.00
#000000	2.20	21.00	1.00	21.00
##FFFFFF	9.55	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#124B8E

Deuteranopia (green-blind)

#00408A

Tritanopia (blue-blind)

#005460

Achromatopsia (no color)

#454545

Design tokens & code

CSS

--color: #1b428b;
/* rgb */ color: rgb(27, 66, 139);
/* oklch */ color: oklch(39.6% 0.130 261.5);

Tailwind

colors: {
  custom: {
    50: '#6a75ad',
    500: '#1b428b',
    950: '#000000',
  },
}

SCSS

$custom: #1b428b;
$custom-light: #6a75ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1b428b",
  "rgb": {
    "r": 27,
    "g": 66,
    "b": 139
  },
  "hsl": {
    "h": 219.107,
    "s": 67.47,
    "l": 32.549
  },
  "oklch": {
    "l": 0.39621,
    "c": 0.12966,
    "h": 261.5
  },
  "luminance": 0.05994
}

Semantic roles & 50–950 ramp

primary

#1B428B

secondary

#BC9345

accent

#AE3DEA

background

#F6F7FA

surface

#ECEDF4

border

#C7C8CE

text

#080810

muted

#7A7B7F

Preview Lab

Preview with #1B428B

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →